论文标题
Singlet-Doublet Majoraana暗物质和中微子质量在最小的I型SeeSAW场景中
Singlet-Doublet Majorana Dark Matter and Neutrino Mass in a minimal Type-I Seesaw Scenario
论文作者
论文摘要
为了同时解释暗物质（DM）和左手中微子的微小但非零的质量，我们提出了通过矢量样的Fermion Doublet和三个右手（RH）单位中微子的矢量式费米（Fermion Doublet）对标准模型（SM）的最小扩展。 DM是Fermion Doublet和Rh Neutrinos之一的中性成分的混合物，都假定在附加的$ \ Mathcal {Z} _2 $对称性下是奇数。结果，DM出现是主要的Majorana粒子，并从$ z $介导的直接搜索约束逃脱，以标志着与Singlet-Doblet Dirac DM有显着差异。其他两个$ \ MATHCAL {Z} _2 $甚至重的RH中微子都会通过I型Seesaw机制产生质量和轻中微子的混合。粒子内容自动允许我们通过测量的$ u（1）_ {b-l} $对称性扩展模型，该_ {b-l} $对称性是无异常的，并在DM和SM粒子之间带来了附加的门户。遗物密度和直接搜索允许通过详细的数值扫描研究两个情况的参数空间，而对撞机搜索策略也被指示。
In a bid to simultaneous explanation of dark matter (DM) and tiny but non-zero masses of left-handed neutrinos, we propose a minimal extension of the Standard Model (SM) by a vector-like fermion doublet and three right handed (RH) singlet neutrinos. The DM arises as a mixture of the neutral component of the fermion doublet and one of the RH neutrinos, both assumed to be odd under an additional $\mathcal{Z}_2$ symmetry. As a result, the DM emerges to be a dominantly Majorana particle and escapes from $Z$-mediated direct search constraints to mark a significant difference from singlet-doublet Dirac DM. The other two $\mathcal{Z}_2$ even heavy RH neutrinos give rise masses and mixing of light neutrinos via Type-I Seesaw mechanism. The particle content automatically allows us to extend the model by a gauged $U(1)_{B-L}$ symmetry, which is anomaly free and brings an additional portal between DM and SM particles. Relic density and direct search allowed parameter space for both the cases are investigated through detailed numerical scan, while collider search strategies are also indicated.
